1621174864 has 20 divisors (see below), whose sum is σ = 3153548160. Its totient is φ = 807356000.

The previous prime is 1621174861. The next prime is 1621174873. The reversal of 1621174864 is 4684711261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621174861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197824 + ... + 205855.

It is an arithmetic number, because the mean of its divisors is an integer number (157677408).

Almost surely, 2^1621174864 is an apocalyptic number.

It is an amenable number.

1621174864 is a deficient number, since it is larger than the sum of its proper divisors (1532373296).

1621174864 is a wasteful number, since it uses less digits than its factorization.

1621174864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403938 (or 403932 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 1621174864 is about 40263.8158151957. The cubic root of 1621174864 is about 1174.7441396117.

The spelling of 1621174864 in words is "one billion, six hundred twenty-one million, one hundred seventy-four thousand, eight hundred sixty-four".